The Pettit couple was found dead in their bedroom last Thursday morning after their Modesto home was allegedly set on fire.

One day later, police ruled the death a homicide.

On Wednesday afternoon, police spent time examining the couple's two dogs to see if their deaths were also suspicious.

Sgt. Ivan Valencia said investigators aren't sure yet who is responsible for the deaths, and also don't have any idea on a motive at this time.

Officials won't address if there were any signs of forced entry, or if weapons were found at the scene because the investigation is still underway.

Police said the case is bizarre, considering the victims were both well-respected members of the community.

Janet Pettit worked as a nurse for Doctors Medical, in Modesto, and Scott Pettit owned and taught at a martial arts studio in Riverbank.

Friends said Scott was giving, and very involved in organizing community activities for kids in Riverbank. He started the first Relay for Life and helped with the classic car show parade in downtown Riverbank, among many other activities.

Daryl Daniel, owner of Sno White Drive In, said Scott helped him put up fans and signs at his business because that's the type of person he was.

Daniel said every time someone orders a tuna melt, he will be reminded of his longtime friend who enjoyed the same meal.

Lisa Borba said her daughter was going to Black Belt Academy for two years and was saddened to hear her teacher was killed.

Flowers and signs were seen outside the martial arts studio where Scott taught for the past decade.

Family and friends say up to 1,000 people may show up Wednesday evening for the memorial.

The Pettits leave behind a 28-year-old daughter and 25-year-old son.

Their son was living with his parents and was at work when the fire started.